Which blood-borne pathogen is known for causing liver disease?

Hepatitis B is the correct choice because it is specifically known as a blood-borne pathogen that directly affects the liver, leading to liver disease. Infection with Hepatitis B can cause a range of health issues, from mild illness to chronic liver disease, including cirrhosis and liver cancer. The virus is primarily transmitted through contact with infectious body fluids, such as blood, making it a significant concern in healthcare settings.

In contrast, Human Immunodeficiency Virus (HIV) primarily affects the immune system, not the liver directly, although it can lead to complications that involve liver disease due to co-infections or opportunistic infections. Influenza virus is a respiratory virus and does not cause liver disease. Norovirus is typically associated with gastroenteritis and affects the gastrointestinal tract rather than the liver. These distinctions highlight why Hepatitis B stands out as the pathogen directly linked to liver disease in the context of this question.